Find out the wrong term.
1, 5, 5, 9, 7, 11, 11, 15, 12, 17

A. 11 B. 12
C. 17 D. 15

• There is two series
  1+4=5
  5+2=7
  7+4=11
  11+2=13
  
  Another
  5+4=9
  9+2=11
  11+4=15
  15+2=17
  
  Ans-12 is Wrong
• 7 years agoHelpfull: Yes(2) No(0)
• 12 is wrong because after 15 the series should be 17,17
• 9 years agoHelpfull: Yes(0) No(1)
• There are two series as 1,5,7,11,12
  and 5,9,11,15,14
  The pattern followed is +4 and +2 alternately in the first series so it should be 11+2=13 instead of 12
  while the second series follows +2+4 and +2
• 7 years agoHelpfull: Yes(0) No(0)